On
this image I already colored the skin. I always do the skin first, if
you do it later it can happen that your dark ink (in this case black)
may run into the lighter colors. And this does not only not look pretty,
it also means a lot of work and trouble if you have to start all over
again.

Step 6 - last one:
Now
I use C3 to color all the remaining areas and blend it all together -
until I like the result. Make sure to not color too far into the dark
areas (I didn't go any further than into the C5 areas) or the color
might fade and bleed out of your outlines.